117 lines
2.8 KiB
Go
117 lines
2.8 KiB
Go
package store
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import (
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"io"
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"io/ioutil"
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"net/http"
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"time"
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"github.com/lbryio/reflector.go/internal/metrics"
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"github.com/lbryio/reflector.go/meta"
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"github.com/lbryio/lbry.go/v2/extras/errors"
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"github.com/lbryio/lbry.go/v2/stream"
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log "github.com/sirupsen/logrus"
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)
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// CloudFrontStore wraps an S3 store. Reads go to Cloudfront, writes go to S3.
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type CloudFrontStore struct {
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s3 *S3Store
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endpoint string // cloudflare endpoint
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}
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// NewCloudFrontStore returns an initialized CloudFrontStore store pointer.
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// NOTE: It panics if S3Store is nil.
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func NewCloudFrontStore(s3 *S3Store, cfEndpoint string) *CloudFrontStore {
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if s3 == nil {
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panic("S3Store must not be nil")
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}
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return &CloudFrontStore{
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endpoint: cfEndpoint,
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s3: s3,
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}
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}
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const nameCloudFront = "cloudfront"
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// Name is the cache type name
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func (c *CloudFrontStore) Name() string { return nameCloudFront }
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// Has checks if the hash is in the store.
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func (c *CloudFrontStore) Has(hash string) (bool, error) {
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status, body, err := c.cfRequest(http.MethodHead, hash)
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if err != nil {
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return false, err
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}
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defer body.Close()
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switch status {
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case http.StatusNotFound, http.StatusForbidden:
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return false, nil
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case http.StatusOK:
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return true, nil
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default:
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return false, errors.Err("unexpected status %d", status)
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}
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}
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// Get gets the blob from Cloudfront.
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func (c *CloudFrontStore) Get(hash string) (stream.Blob, error) {
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log.Debugf("Getting %s from S3", hash[:8])
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defer func(t time.Time) {
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log.Debugf("Getting %s from S3 took %s", hash[:8], time.Since(t).String())
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}(time.Now())
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status, body, err := c.cfRequest(http.MethodGet, hash)
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if err != nil {
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return nil, err
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}
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defer body.Close()
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switch status {
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case http.StatusNotFound, http.StatusForbidden:
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return nil, errors.Err(ErrBlobNotFound)
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case http.StatusOK:
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b, err := ioutil.ReadAll(body)
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if err != nil {
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return nil, errors.Err(err)
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}
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metrics.MtrInBytesS3.Add(float64(len(b)))
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return b, nil
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default:
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return nil, errors.Err("unexpected status %d", status)
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}
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}
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func (c *CloudFrontStore) cfRequest(method, hash string) (int, io.ReadCloser, error) {
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url := c.endpoint + hash
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req, err := http.NewRequest(method, url, nil)
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if err != nil {
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return 0, nil, errors.Err(err)
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}
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req.Header.Add("User-Agent", "reflector.go/"+meta.Version)
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res, err := http.DefaultClient.Do(req)
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if err != nil {
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return 0, nil, errors.Err(err)
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}
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return res.StatusCode, res.Body, nil
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}
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// Put stores the blob on S3
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func (c *CloudFrontStore) Put(hash string, blob stream.Blob) error {
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return c.s3.Put(hash, blob)
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}
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// PutSD stores the sd blob on S3
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func (c *CloudFrontStore) PutSD(hash string, blob stream.Blob) error {
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return c.s3.PutSD(hash, blob)
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}
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// Delete deletes the blob from S3
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func (c *CloudFrontStore) Delete(hash string) error {
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return c.s3.Delete(hash)
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}
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